Portion of a LED light bulb



FIG. 1 is a front elevational view of a portion of a LED light bulb showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a perspective view thereof.

The broken lines shown in Figs. form no part of the claimed design. 

CLAIM The ornamental design for a portion of a LED light bulb, as shown and described. 